Salida de campo de los hermanos del autor Carlos y Luis Valverde Gómez, posiblemente acompañados del autor, al Monte Blanco, en Valladolid, el 10 de febrero de 1952, de la que se anotaron observaciones sobre las siguientes aves: Pica pica (Urraca, llamada "marica" y "picarza" por el autor), Pyrrhocorax sp. (Chova) y Sturnus sp. (Estornino).
Field trip of two brothers of the author, Carlos and Luis Valverde Gómez, possibly accompanied by the author, to the Monte Blanco, at Valladolid, the 10th of February of 1952, of which there were noted observations about the following birds: Pica pica (Black-billed Magpie), Pyrrhocorax sp. (Chough) and Sturnus sp. (Starling).
